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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m² hr °C
kcal/m²
kcal/hr °C
kcal/m hr °C

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Heat and Mass Transfer
The amount of radiation mainly depends upon the

All of these
Temperature of the body
Nature of the body
Type of surface of the body

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when(Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 0 and a = 1
P = 0, x = 1 and a = 0
X = 0, a + p = 1
P=1, T = 0 and a = 0

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

66.7°C
40°C
60°C
20°C

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for gases
More or less same as for liquids and gases
More than those for liquids and gases
Less than those for liquids

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Prandtl number and Reynold number
Grashoff number, Prandtl number and Reynold number
Grashoff number and Reynold number
Grashoff number and Prandtl number

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MORE MCQ ON Heat and Mass Transfer

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